Perhaps you should try some spelling variations:
"world ai technical paper" » "world ai technical papers", "world api technical paper", "world ii technical paper", "world vi technical paper", "world aii technical paper", "world a2 technical paper", "world a8 technical paper", "world a technical paper"
"world i technical paper" » "world i technical papers", "world ii technical paper", "world 2 technical paper", "world 8 technical paper"

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• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"world ai technical paper\") OR (\"world i technical paper\"))".
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